Mold for plastic materials.



.Z ATBNTED FEB. 6, 1906.

A. S. WATTS. 0R PLASTIC MATERIALS.

MOLD P APPLICATION FILED SEPT. 29, 1905,

ll'llill id'lliiillldf l rarest ARTHUR S. "A'iTS. OF Vltl'Oit, NEW YORK,ASSIGNOR TO THE LOCliilll INSULATOR MANUFACTUl-UNH COIilPr-XNY, OFVICTOR, NEW YORK, A.

CORPORATION OF Xlill' YORK.

Specification of Letters Patent.

Patented Feb. 6, 190$.

Application filed September 29. 1905. Serial No. 280,633.

To all whom it may concern.-

Be it known that l, ARTHUR S. 'AT'rs, of Victor, in the county ofOntario and State of New York, have invented certain new and usefulImprovements in Molds for Plastic Materials; and I do hereby declare thefolldw ing to be a full, clear, and exact description of the same,reference being had to the accompanying drawings, forming a part of thisspecification, and to the reference-m1merals marked thereon.

My present invention relates to improvements in molds for forminginsulators and similar articles of plastic material, and has for itsobject to provide a mold to housed in the manufacture of high-tensionporcelain in-- sulators, whereby the portions of the insula tor, andparticularly the edges of the petticoats 1ua v be oi uniform tl(nSiiY,S0 as not to be liable to be punctured by high-voltage currents, andat the same time the porcelain will be dense and homo cneous throughout.This result is obtained y arranging an air vent or aperture in the dieor lunger which comprchends the entire edge 0 the pet-ticoat or similarpart of the molded article, so that while the air is permitted to escapefrom the recessed ortion of the die or form the article is presse evenlyup to this extreme edge.

This invention is an improvement upon and particularly applicable to themachine shown in Letters Patent No. 716,343, granted December 16, 1902,to F. M. Locke, in which is shown a die for molding insulators withseparate air-vents at the ed res of the petticoat; but the objection tothis patented arrangement is that where the isolated holes are employedclay is squirted out of these molds and at these points is put underless pressure than at portions not so vented, resulting in uneven amountof com actness in the clay after being formed, Whic results in crackinthe edge of the etticoat, and I have found that by forming" t. cseapertures into a continuous annular slot through which first the air isejected and then a very narrow portion of the plastic clay is squirtedout the portions of the etticoat being formed are subjected to the samepressure and the result is very satisfactory.

To these and other ends the invention con sists in certain improvementsand. combina tions of parts, all as will hereinafter more fully appear,the novel features being pointed out in the claims at the end. of thespecifics 5;

tion.

In the accompanying drawings, Figure 1 is a vertical sectional view of aplunger and mold constructed in accordance With my in vention andadhptcd to be used with a suit chine such as contained in said patent.FIG. 2 is an end view of the plun er or die.

figures Similar refcrence-numera s in both indicate similar parts.

1 indicates a mold for she ing the exterior or top of the insulator,which in use is prefer ably stationary, while the mold-section oarriedupon the plunger or movable portion of r the press consists, preferably,of ahead 2, pro

vided with a projecting pin 3 at its lower end threaded on the exterior,as shown, for moldiug'z the thread in the insulator, and 4 indicatcs acollar or mold-sect1on secured to the head 2, preferably by a threadedconnection,

as shown, the lower surface of this collar co operating, with the lowerportion of the head to give the desired contour to the bottom oi theinsulator being formed, the inner shoal der 5 of this collar 4 and theshoulder 6 on the head 2 servings, to mold thelower edge of theetticoat. The shoulders are separated to torma narrow passage 7,communicating with the chamber 8, that is open to the air by means ofapertures 9 or 0t erwise. When the mold-sections are brought togetherand the one carrying the pin 5 is rotated, the

lastic material (indicated by 10) is forced up lietween the shoulders 5and 6, the air is ex polled through the narrow annular charnlel 7, and avery small portion of the plastic mate rial is squirted into the chamber8; but the channel is so narrow that a practically uniit ii the machinereferred to, in which it is given a l the material is pressed, saidmember having rotary motion and is the movable member, this is notessential.

While I have shown the mold as construeted to form a single pettieoat onthe insulator. it is obvious that iteould be readily modified to formseveral, as in the beforementioned Letters Patent, without departingfrom my invention.

I claim as my invention- 1. A mold or plastic material embodying twoeoifqn'rating members between which the lastie material is pressed, oneof said mem- ,)ers having: an annular'reeess for forming a flange on themolded article and a narrow an nular passage at the bottom of saidrecess for permitting the passage of airs 2. A mold for forminginsulators from plastie materials embodying two cooperating membersbetween which the material is pressed, one of said members having theannular recess for forming a pettieoat on the insulator and a narrowannular passage at the extreme bottom of said recess for permitting theexit of air and an exoeedinglv narrow film of the material being molded,and the other mold member forming the. exterior of the insulator.

3. A mold for forming insulators from plastie material embodying amember by which chamber 8.

an annular shoulder thereon and having an outer annular section providedwith a shoulder thereon corresponding to the first-mentioned shoulder tomold the edge of an insulator-petticoat and a narrow annular chan nelbetween said shoulders through which the air and a film of plasticmaterial narrower 4. In a mold for forming insulators from lastiematerials, the eomhination with a read provided with the annularshoulder t), and a threaded projeeti m (attending beyond it, of an outerrenmv'able sertion 4 provided with an annular shoulder 5 eorrespomiingto the shoulder 6, and separated therefrom by a narrowehaunel' 7. v r

5. The 'eombination with the mold-head having the shoulder (t, theprojection 15 secured in the end of the head and having the exteriorthreaded portion, of the annular member 4 seei'ired'to the exterior ofthewhead provided with the shoulder 5 arranged in close pmximit to theshoulder ti on the head to form a narrow passage 7 and the annularARTHUR t5. \\'.-\'l."lS'. Witnesses:

, Jonx 5. Lame, l'lnx nr M. Panamna.

